org.eclipse.persistence.internal.jpa.parsing.PlusNode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation

EclipseLink build based upon Git transaction f2b9fc5

There is a newer version: 5.0.0-B03

/*
 * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.internal.jpa.parsing;

import org.eclipse.persistence.expressions.*;
import org.eclipse.persistence.queries.ObjectLevelReadQuery;
import org.eclipse.persistence.queries.ReportQuery;

/**
 * INTERNAL
 * Purpose: Represent a '+' in EJBQL
 * 
Responsibilities:

 *  Generate the correct expression for a '+'
 * 
 *    @author Jon Driscoll and Joel Lucuik
 *    @since July 2003
 */
public class PlusNode extends BinaryOperatorNode implements AliasableNode {
    public PlusNode() {
        super();
    }

    /**
     * INTERNAL
     * Apply this node to the passed query
     */
    @Override
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            reportQuery.addAttribute("plus", generateExpression(context), (Class)getType());
        }
    }

    /**
     * INTERNAL
     * Validate node and calculates its type.
     */
    @Override
    public void validate(ParseTreeContext context) {
        super.validate(context);
        if ((left != null) && (right != null)) {
            TypeHelper typeHelper = context.getTypeHelper();
            setType(typeHelper.extendedBinaryNumericPromotion(
                    left.getType(), right.getType()));
        }
    }

    /**
     * INTERNAL
     * Generate the expression. The steps are:
     * 1. Generate the expression for the left node
     * 2. Add the .plus to the where clause returned from step 1
     * 3. Generate the expression for the right side and use it as the parameter for the .plus()
     * 4. Return the completed where clause to the caller
     */
    @Override
    public Expression generateExpression(GenerationContext context) {
        Expression whereClause = getLeft().generateExpression(context);
        whereClause = ExpressionMath.add(whereClause, getRight().generateExpression(context));
        return whereClause;
    }

    @Override
    public boolean isPlusNode() {
        return true;
    }

    @Override
    public boolean isAliasableNode(){
        return true;
    }
}